from flask import render_template, flash, redirect, url_for, request 
from microblog.app import app, db
from microblog.app.form import LoginForm, RegistrationForm, EditProfileForm, PostForm
from microblog.setting import Config
from flask_login import current_user, login_user, logout_user, login_required
from microblog.app.models import User, Post
from werkzeug.urls import url_parse 
from datetime import datetime
from loguru import logger

@app.before_request
def before_request():
    if current_user.is_authenticated:
        current_user.last_seen = datetime.utcnow()
        db.session.commit()


@app.route('/', methods=['GET', 'POST'])
@app.route('/index', methods=['GET', 'POST'])
@login_required
def index():
    form = PostForm()
    if form.is_submitted():
        post = Post(body=form.post.data, user_id=current_user.id, timestamp=datetime.utcnow())
        db.session.add(post)
        db.session.commit()
        flash(f'Your post is live now!')
        return redirect(url_for('index', form=form))
    posts = current_user.followed_posts().all()
    #logger.info(f'Your post is {posts}!')
    return render_template('index.html', title='Home', posts=posts, form=form)

@app.route('/login', methods=['GET', 'POST'])
def login():
    if current_user.is_authenticated:
        return redirect(url_for('index'))

    form = LoginForm()
    if form.validate_on_submit():
        user = User.query.filter_by(username=form.username.data).first()
        if user is None or not user.check_password(form.password.data):
            flash('Invalid username or password')
            return redirect(url_for('login'))
        flash(f'Login requested for user {form.username.data}, remember_me {form.remember_me.data}')
        login_user(user, remember=form.remember_me.data) 
        next_page = request.args.get('next')
        if not next_page or url_parse(next_page).netloc != '':
            next_page = url_for('index')
        return redirect(next_page)
    return render_template('login.html', title='Sign In', form=form)

@app.route('/logout')
def logout():
    logout_user()
    return redirect(url_for('index'))

@app.route('/register', methods=['GET', 'POST'])
def register():
    if current_user.is_authenticated:
        return redirect(url_for('index'))
    form = RegistrationForm()
    if form.validate_on_submit():
        user = User(username=form.username.data, email=form.email.data)
        user.set_password(form.password.data)
        db.session.add(user)
        db.session.commit()
        flash('Congratulations, you are now a registered user!')
        return redirect(url_for('login'))
    return render_template('register.html', title='Rigister', form=form)


@app.route('/user/<username>')
@login_required
def user(username):
    user = User.query.filter_by(username=username).first_or_404()
    posts = user.posts().all()
    return render_template('user.html', user=user, posts=posts)


@app.route('/edit_profile', methods=['GET', 'POST'])
@login_required
def edit_profile():
    form = EditProfileForm(current_user.username)
    if form.validate_on_submit():
        current_user.username = form.username.data
        current_user.about_me = form.about_me.data
        db.session.commit()
        flash('your changes have been saved.')
        return redirect(url_for('edit_profile'))
    elif request.method == 'GET':
        form.username.data = current_user.username
        form.about_me.data = current_user.about_me
    return render_template('edit_profile.html', title='Edit Profile', form=form)


@app.route('/follow/<username>')
@login_required
def follow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(f'User {username} is not found')
        return redirect(url_for('index'))
    if user == current_user:
        flash(f'You can not follow youself!')
        return redirect(url_for('user', username=username))
    current_user.follow(user.id)
    db.session.commit()
    flash(f'You are following {username}')
    return redirect(url_for('user', username=username))

@app.route('/unfollow/<username>')
@login_required
def unfollow(username):
    user = User.query.filter_by(username=username).first()
    if user is None:
        flash(f'User {username} is not found')
        return redirect(url_for('index'))
    if user == current_user:
        flash(f'You can not unfollow youself!')
        return redirect(url_for('user', username=username))
    current_user.unfollow(user.id)
    db.session.commit()
    flash(f'You are unfollow {username}')
    return redirect(url_for('user', username=username))

@app.route('/explore')
@login_required
def explore():
    page = request.args.get('page', 1, type=int)
    posts = Post.query.order_by(Post.timestamp.desc()).paginate(page, Config.POST_PER_PAGE, False)
    next_url = url_for('explore', page=posts.next_num) if posts.has_next else None
    prev_url = url_for('explore', page=posts.prev_num) if posts.has_prev else None
    return render_template('explore.html', tile='Explore',
                           posts=posts.items, next_url=next_url, prev_url=prev_url)





